<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var str = 'asdfadfashddhfcnjhjrwwwzdgagjzwenzzzzzlyly'
        var obj = {}
        for(var i = 0; i < str.length; i++){
            var chars = str.charAt(i)
            if(obj[chars]){
                obj[chars]++
            }else{
                obj[chars] = 1
            }
        }
        // console.log(obj)
        var max = 0
        for(var k in obj){
            if(max < obj[k]){
                max = obj[k]
                ch = k
            }
        }
        console.log('出现次数最多的是：' + ch + ' ' + '出现了' + max + '次')


    </script>
</body>
</html>